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Web Server Hanging

I am facing an Issue with web server which configured in fedora box , where its getting hanged frequently. I am facing this problem past week, I have observed that due to memory utilization its getting hanged state. every time its getting hanged we are starting it manually, which we are facing a tough time.

from the logs I have observed that we are getting hits from only particular IP, again and again. and server is getting hanged daily almost same time

My client is very unhappy with this.... I need to crack this somehow.....

Sounds like you are under attack and need to discover what that ip
address is (try the "whois" and "host" commands) and probably block it
at your inbound firewall. Is your web server's operating system and the
web server software itself fully up to date?

Alternatively to improve the uptime of the web server process itself -
and thereby to improve your client's perceptions - you could install the
simple nagios monitoring service, have it check that your web service is
up and have it issue a service restart command if it finds that it is
not up. I'd only do that if it was occurring a few times a day.

First try to address which type of concurrent request you are getting
on your web server, It may be possible someone try to scan your
webserver, observer the logs and try to block unwanted hits on
webserver.